| Name | Cirsium tweedyi (Rydberg) Petrak |
| Authorship | (Rydberg) Petrak |
| Rank | Species |
| Placed in | Cirsium Miller |
| Citation | 1917 [5 Oct 1917] Beih. Bot. Centralbl., Abt. 2. 35: 560 |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Cirsium tweedyi (Rydberg) Petrak |
| Identification made in | [no date] (5), 1962 (1), 1967 (1) |
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